pulso
/ˈpulso/ · B1 · noun · m
pulsation
💓💪 Pulso = pulse, from Latin pulsus, a beat or push
Latin pulsus meant a push or beat, which gives both the heartbeat and the steady push of a hand. Echar un pulso means to arm-wrestle, and a steady hand (buen pulso) is what you need to aim.